Exchange 2003 IMAP Fails Intermittently

My mail server is running exchange 2003 enterprise.  several times each week (and completely randomly) IMAP just stops responding.  So far the only thing that seems to fix the problem is a reboot.  

When I run Microsofts Port Query tool I receive the following results during an outage:


TCP port 143 (imap service): Listening
Data returned from port:
BYE Connection refused


Does anyone know how to fix this once and for all?
deklinmAsked:
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v_9mhdrfConnect With a Mentor Commented:
Please add Local Ip address in the Ip allowed list in IMAP configuration.
And try testing telnet with port 143.

try this and revert back if you have any issues.
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Bird DogCommented:
do you have any errors in you event log?
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Mohammad Ishtyaq KhatriCommented:
Have you check the firewall, Is the port 143 is open?? Also check the below article.

http://support.microsoft.com/kb/270836

Thanks,
AgentMIK
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deklinmAuthor Commented:
where do i do this?..............Please add Local Ip address in the Ip allowed list in IMAP configuration.
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